Abrasive apparatus.



E. J. BBIN. ABRASIVE APPARATUS. APPLIoATIoN HLBD AUG. 2,1907.

Patented Aug. 27, 1912.

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weaves,

Specification o1' Letters latent.

Patented Ang.. 27., i912.

To all whom t may concern Beit known that l, EMILE d. Bem, ot

Newark, New Jersey, have invented certain designating like parts.

This invention relates to abrasive appsratus, and is oi particular utility when appliedto machines of the type formino' the subject matter oil my United States Letters Patent No. 561,557, dated June 9, 1896, and blo-833,726, dated October Q3, 1906, the distingu'ishing feature ci these machines, re spectively,I being an endless flexible belt, surfaced with grains of abrasive material, which traverses a Worktable or platen, vertical or horizontal, provided 'to sustain the beltegainst the stress or. the Work pressed against the belt tor its abrasive action.

ln accordance with my invention, l con struct the worlrtable with a grooved, edrrugated, or otherwise interriqited surface, and in cooperation therewith, and with the abrasive belt, l provide an auxiliary driving and cushion belt, these structural novelties subservi-np,1 functions which may be summarized brieiy as ollows:-Fii the interrupted surface presents a seri of projecting or salient portions which cause the portions of the belt in transit immediately .over them to bite into the piece ot work held thereagainst, while-the intervening portions of the belt opposite the grooves or cut-away portions act with less abrasive effect on the Work, the latter being 'usually moved to and Jfro, so that each portion is subvjected in turn to the biting1 action; second :M

the reduction in area of the region of con 4tact between the belt and work, Aand the belt and work table, reduces the friction, and consequently the heat developed, to an eX- tent which may reach ility per cent., so that the operator may readily hold in his bare hand even a small piece oi metal work with out discomfort from heat, While the work piece is being out down. rapidly and tensively; thlrdz--the auxiliary belt, be ing preferably .tree from the abrasive belt,

permits the latter to lag behind somewhat on each revolution, so that each portion oli, the area of the abrasive belt is presented in turn opposite any given portion of the auxiliary belt, preventing undue Wear upon any portion of either belt; tourt-h :-When, as

l prefer, the grooves extend wholly across the worktable :trom side to slde, at an angle of say 45o to the direction of travel ot the.4

belts, there is set up in the grooves a brisk,

`transverseV circulation ot air, owing to the slant of the grooves, serving not only to cool the worlftable belts and work, but also to carry oit to the side the particles of metal cut from the worlr, and which normally tend to lill up and clog the interstices be tween the abrasive particles, preventing them `trom biting into the Work, and i`ncreasing; the friction; lifth:-a cushion is forme l between the worlrtable and the abra sive belt by the air imprisoned in the grooves, and also lby the auxiliary belt,

which preferably 'will be formed of elastic material for that purpose, (and to enable it to be stretched into driving interior contact with the relatively unyielding abrasive belt), and by this cushion, the harsh and destructive action suilered normally by the abrasive belt, between a workpiece and the rougghcned surface ot 'thevhard Workt'able,

is prevented, cbviating the tendency to t knock down the abrasive grains, and even tear the abrasive belt; the abrasive grains are usually secured to the belt by an adhesive and so the reduction of friction and heet already detailed, vremoves a conn tribnting factor in the knocking down C viz., the softening of the adhesive, and

loosening ci the abrasive grains. v

The various features of my invention will be illustrated and described fully in the accompanying drawings and Specification, with especial reference to the embodiment selected as a convenient 'form to enable ready and complete ui'xderstanding ot' my invention, which will be pointed out also in the claims, the latter covering the use of my improvements in any field to which the may be adapted by their nature.

in the drawings: Figure l is a view, in

perspective,A of a vertical sand belt machine in the construction of which my irnprovements have been embodied; Fig. 2 is a slmilar view -taken separately, of a modified form of table for a horizontal machine of the same type, illustrating also the mode of adjustable attachment; Fig. 3 is a view in side elevation, on an enlarged scale, of a i portionof the work table, showing .the

grooves. V y.

' The partl designated by the re'ference l numeral y1 is'the worktable or platen of a bel sander of the type forming the subject m United States Letters Patent No.

S33/Etna ove mentioned, to which reference may bel-.made for a more detailed description of the construction and operation of the machineas a whole, and in accordance with 'my invention the worktable has an interrupted tsurface,l the interruptions being formed in the instance illustrated, by groovesA 2 cast, or ,formed in any convenient manner, in the ace'of. the worktable, which preferably willbe machined to give the salient y portions ,3 a `smooth 'finish The v grooves may be .all V shaped, as shown in Fig. 3, spaced apartat intervals about equal to their width, andof/similar depth, or they may be of any suitable and convenient contour, as the -semici'rcular grooves 4 in Fig. 2,

occupying part of the worktable 5, whilethe other-part has grooves 6, like the grooves 2 already described, so that the operator may avail of any difference in operation of theI constantly changing transverse depressions"y with a shifting trend which moves sidewise the metallic particles cut from the workt and prevents them from clogging the'interstices between the abrasive particles, th'us keeping the latter in a condition of high abrasive efliciency and avoiding a source 0f frictlon. These ygrooves may, and preferably will, be formed at such an angle (of say about 45) to the direction of movement of theabrasive belt 7, that'air will be drawn into the grooves at the Side 8, and be discharged at the side 9, cooling .the work-I table, belt, and any workpiece pressed there against, aiding to carry otf laterally the particles of metal out from the workpiece, and forming an air cushion between the belt and the worktable. Y

An importantfeature of my invention is .into ,which said sheet may enter'to form found in the auxiliary endless band or belt 10, preferably formed of elastic fabric, to give it cushioning quality, and also to permit the band to be stretched into snug contact with the interior of the abrasive belt 7 when, as prefer, the auxiliary belt is utilized as a driving belt, receiving its actua- `tion from one of the drums 11, 12 around which the belts may be stretched as'a convenient support, a fast and loose pulley 13 on the drum shaft 14 serving for transmission and control of the power received from any suitable source (not shown). A

To enable interchange of worktables having surfaces suited to the work in hand, and.

to .permit leveling, or adjustment, of the worktable, I have shown draft'bolts 15 and set screws 16, by which the respective table selected may be secured in desired position upon the supports 17 mounted on the base 18, the latter being of any convenient and suitable onstruction.

-Having described my invention thus fully,

it will be understood thatI do not limit myself to the specific materials, nor the exact construction and arrangement of parts illustrated, nor general lotherwise than as set forth in the claims read in connection with v this specification. u

What-I claim as new, and desire to secure by Letters Patent, is:A

1. A worktable having a surface provided with transverse anglarly disposed grooves,

support a movablemember, substantially in the manner and for the purpose set forth.

' 2. A worktable to be traversed by an abrasive sheet; said worktable having asurface provided with Ameans to impart a transverse direction to the air current' set up by said moving sheet, substantially inthe manner and for the purpose set forth.

3. A worktableto be traversed by an abrasive sheet, said worktable having a sur.

face provided with transverse depressions channels for lateral clearance of the parti- 'and with intervening salient portions to.,

cles cut from the work by the abrasive action of said'sheet in traversing the intervening salient portions, subst-antially as described.

L1. The combination'with a worktable having an interrupted surface; of an abrasive member arranged to traverse said interrupted surface, and having a movement relatively thereto during such traversal; substantially in the manner and for the purpose, set forth. 1

. 5. A worktable to be traversed by`an abrasive sheet; said worktable comprising ahard, working-surface provided with channels openf throughout their length for free circulation of air under the influence of a portion of said abrasive device as it travels over' said ehafnels, y he latter eoiistitutin and State of New Jersey, this thirteenth Icoollngend cushioning devices to preveng` day of July, 1907.

destructive action upon the Work and uponv EMILE J; BEIN. y

said sheet between Said Worktable and the., 5 Work pressed thereagainst, 'substantially as. In presence of describedf ,y g l S. R. CAIRNS,

Signed at Newark, in the county ofEsseX CHAS. E. HILLYER. 

